数据结构之---C语言实现二叉排序树（BinarySortTree）

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这里又叫做二叉搜索树

代码：

//二叉排序树(二叉搜索树Binary Search Tree)//杨鑫#include <stdio.h>#include <stdlib.h>typedef struct node{int key;struct node *lchild, *rchild;}BSTNode, *BSTree;//插入int InsertBST(BSTree *bst, int k){BSTree r, s, pre;r = (BSTree)malloc(sizeof(BSTNode));r->key = k;r->lchild = NULL;r->rchild = NULL;if(*bst == NULL){*bst = r;return 1;}pre = NULL;s = *bst;while(s){if(k == s->key)return 0;else if(k < s->key){pre = s;s = s->lchild;}else{pre = s;s = s->rchild;}}if(k < pre->key)pre->lchild = r;elsepre->rchild = r;return 1;}void CreateBST(BSTree *bst){int key;*bst = NULL;scanf("%d", &key);while(key != -1){InsertBST(bst, key);scanf("%d", &key);}}/* *打印二叉树： *中序遍历 * */void InOrder(BSTree root){if(root != NULL){InOrder(root->lchild);printf(" %d ", root->key);InOrder(root->rchild);}}/* *搜索 * */BSTree SearchBST(BSTree bst, int key){BSTree q;q = bst;//递归while(q){if(q->key == key)return q;if(q->key > key)q=q->lchild;elseq=q->rchild;}return NULL;                        //查找失败}int main(){BSTree T;int tag = 1;int m, n;printf("建立二叉排序树，请输入序列以-1结束：\n");CreateBST(&T);printf("中序遍历二叉树，序列为：\n");InOrder(T);printf("\n");while(tag != 0){printf("请输入你要查找的元素:\n");scanf("%d", &n);if(SearchBST(T, n) == NULL)printf("抱歉查找失败!\n");elseprintf("查找成功！查找的数字为%d\n", SearchBST(T,n)->key);printf("是否继续查找 是 ：请按 1 否则按 0:\n");scanf("%d", &tag);}return 0;}

结果：

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